Electric iron



March 11, 1952 E, BRAUNER ET AL 2589,@40

ELECTRIC IRON Filed Dec. 6, 1945 3 Sheets-Sheet 1 /Nn-w ro es: EPA/5.5 r Eem/MEE, Hue/cf .J DEN/WN@ March 11, 1952 E. BRAUNER Er AL 2589,04@

ELECTRIC IRON `Filed Deo. 6, 1945 5 Sheets-Sheet 2 ZA l 10.3 99 '90 March H, w52 E. BRAUNER Er AL ELECTRIC IRON 3 Sheets-Sheet 5 Filed Dec. 6, 1945 Patented Mar. l1, 1.952

ELECTRIC raoN Ernest Brauner, St. Louis, and Maurice J. Denning, St. Charles, Mo., assignors to The Emerson Electric Manufacturing Company,

Louis, Mo., a corporation of- Missouri Application December 6, 1945, Serial No. 633,137

11 claims.

The present invention relates to an electric iron.

It is an object of the invention to provide an electric iron which has complete protection of the hand of the operator from being burned by heat in the top section of the iron. It is a further obj ect to provide an iron which has a streamlined construction, and hence a relatively low handle, without any danger of burning of the hand of the operator by its proximity to the hot parts of the iron.

More particularly, it is an object of the in- Vention to provide an electric iron having a sole plate cover and separate laminations between the cover and the handle, one of which provides an air space and the other of which is of heat insulating material. It is a further object of the invention to provide an iron of the foregoing type in which a thermostatio heat adjustment is arranged for convenient operation by the nger of the operator of the iron and which is suitably heat protected to prevent the burning of the operators hand upon the movement of the adjusting means. A further object is to provide the adjusting means in connection with a heat insulating plate covering the top of the base of the iron and separate from the handle proper that, nevertheless, is disposed conveniently at the front of the handle.

A further object of the invention is the provision of a novel control of the thermostatic means, including a novel arrangement and disposition of a thermostatic switch.

Further objects include the arrangement of the parts for quick assembly and disassembly.

Additional objects will appear in the description to follow, wherein:

Fig. 1 is a plan view of the iron;

Fig. 2 is a side elevation, partly broken away;

Fig. 3 is a rear elevation;

Fig. 4 is a horizontal section at the front of the iron on the line 4-4 of Fig. 2;

Fig. 5 is a substantially horizontal section -beneath the insulating plate immediately below the handle, taken on the line 5-5 of Fig. 2;

gFig. 6 is a section of the toe of the handle, showing part of the handle locking means, taken on a medial line from front to rear of the handle;

Fig. 7 is a horizontal section of the forward part of the iron, taken through the shroud on the line l-l of Fig. 2;

Fig. 8 is a vertical section through the forward part of the iron, taken approximately on the line 8 8 of Fig. 2;

Fig. 9 is a side elevation of the thermostatic switch;

Fig. 10 is a vertical section, taken on the line |0-I of Fig. 9, showing the thermostat adjusting means;

Fig. 11 is a vertical section through the switch blades, taken on the line of Fig. 9;

Fig. `12 is aplan View of the base of the iron with thecover removed; Y. l

Fig. 13 is a side elevation of the base of the iron with the cover removed;

Fig. 14 is a rear elevation of Fig. 13;

Fig. 15 is a section on the line |5|5 of Fig. 12, showing the power line terminals;

Fig. 16 is a section of the rear of the handle n appear, along with necessary electrical connections. Above the sole plate and covering the top parts thereof is a cover or shroud 22. This cover has a more or less flat upper surface that inclines downwardly from front to rear ofthe iron.

Above it is located a hollow metal plate 23, to be described in greater detail. Superposed over theA plate 23 is a plate 24 of insulating material, such as plastic. A handle 25 is attached above the insulating plate 24.

The sole plate 2|! is preferably a single casting, with a heating element 28 cast integral therein. The heating element is generally U-shaped, with its ends projecting out at the back of the sole plate in two terminals 29 and 30. It will be seen that the bottom part 2l of the sole plate has the lower ironing surface which is fiat.

The sole 2| extends up a predetermined distance in a, beveled edge, and then has a at platform surface 3| that is substantially horizontal. The casting of the sole plate rises from the shelf 3| to form walls of more or less U-shape. Toward the toe of the iron, the rst elevation is shown at 32. This rising portion 32 is rounded at its forward end and extends backwardly somewhat in the shape of an arrow head, as shown in Fig. 12. From its rear ends, two prow-like portions rise further at 34 and 35. These portions or walls slope off toward the front at 36 and slope at their sides to merge with the upper surface 3| on the sole 2|. They have inner side edges 31 and 38, which extend downwardly in varying amounts to or below the top surface 3|.

As shown in Fig. 13, in profila-and also in Fig.

14, there are two circular integral buttons 39 and'I 4|] extending upwardly from the top edges of the two walls 34 and 35. These are to receive sorews as will appear.

About midway back of the two Walls 34 and 35,l

there is a lowering of the top surfaces at 4| and 42.

Adjacent their outer rear edges, two small projections 45 and 46 extend upwardly adjacent the The inner surfaces of the two side walls 34 andv 35 and the forward lower rising portion 32 pro-V At the back, the two surfaces are provided with facing inclined cut-away portions 43 and 44.

vide, with the bottom, an enclosure extending inwardly from the back end of the sole plate. This enclosure is open at its top. It includes a forward section 49, which receives the thermal element, as will appear. Slightly ahead of the middle part of the iron, this declivity in the sole plate is lowered at 50 to form a deeper declivity that extends substantially to the back edge of the bottom part 2| of the sole plate. It will be seen that the portion 49 has a central declivity 5| therein, that is slightly below the surface 3|, and that the rear declivity 50 is substantially below the surface 3|. It will also be seen that the heating element 28 extends around the sole plate largely within the wall parts 32, 34 and 35.

The sole plate assembly, at its back end, is provided with a terminal supporting bracket 54, screwed at 55 and 56 into openings provided in the edge of the sole plate. This bracket extends upwardly and backwardly at an angle, with a turned-over top edge in its medial parts, substantially as shown rat 51 in Figs. 12 and 13. The leads 58 and` 59 from a power cable are connected to this bracket 54 at electrical terminals 60 and 6|. Fig. l5 shows the terminal 6| as comprising twotelescoping insulating bushings 62 and 63 that intert through a suitable opening in the bracket 54. A screw part 64 ts through the bushings |62 and 63 and, at its outer end, receivesk nuts 85 and 56 that hold the interior connecting line. The exterior connection 59 is made through a screw 61 that is threaded into the screw 64. The head of this screw faces backward and downward. The other terminal 60 may be identically constructed.

The wall 35, adjacent its forward end opposite the cut-away part 49, is provided with an arcuate notch 69 for a purpose that will appear.

The declivity in the bottom of the cut-away part 49 is adapted to receive a bimetal strip 10, screwed down at 1 I.

The cut-away parts 49 and 50 between the walls 34 and 35 are designed to receive a thermal switch. This switch is built generally upon a bracket 15, shown in plan view in Fig. 7. It bridges across the iron between the two circular buttons 39 and 40 on the top surfaces of the two walls 34 and 35. Two screws 16 andY 11 extend into the two buttons 39 and 40, to secure the bracket 15 in place.

Midway along its rear edge, the bracket has a T-shaped'projection 18, which has downturned side flanges 19 and 80. These sideV flanges form pivot pin receiving ears holding a pivot pin 8|. This pivot pin also receives upstanding ears 82 and 83 on a lever or arm 84, which is thereby supported for rocking movement. A hairpin spring 85 is riveted to the bracket 15 at 86 and extends downwardly to engage a sloping end part 81 on the lever 84, as shown in Fig. 9. The spring pivots the lever 84 clockwise about the pivot 8| in Fig. 9.

At its outer end, the lever 84 supports two switch contact blades 90 and 9|, secured by rivets 92, and duly insluated one from another by an insulating bushing 93 and layers of insulation 94, 95 and 96. A retaining plate 91 may be applied over the top of the insulation to form a holding washer for the head of the rivets.

The blade 90 is a spring blade extending forwardly beyond the end of the lever 84 and provided with an insulating shoe 98 projecting downwardly from its outer end. This shoe is adapted to abut the free end of the bimetal strip 10.

The blade 90 also carries a relatively movable switch contact 99 that is adapted to engage with a. related relatively fixed contact |00 disposed ori the outer end of the relatively rigid blade 9|. The blade 9| extends rearwardly and has a terminal end |0| thereon. The other blade 90 has a lateral terminal projection |02.

The lever 84, adjacent its outer end, is provided with a lateral projection |05 extending upwardly and over at its upper end. It is disposed to come beneath a thermostat adjustment cam. The thermostat adjustment includes a sleeve ||0 threaded into a split extension I I I on the bracket 15. The sleeve is provided with a hexagon head so that it may be adjustably positioned in the bracket, whereby the thermostat may be calibrated. The sleeve I|0 receives an adjusting shaft II3, which has a collar ||4 thereon limiting the downward movement of the shaft I I3 into the sleeve. A retaining ring I|5 is located in a groove on the shaft ||3 below the sleeve ||0 to limit upward movement. It its bottom end, the shaft ||3 supports a cam IIS that is in position to engage the projection |05 on the blade 84. The spring causes the blade 84 `to pivot in such wise as to maintain the projection |05 against the cam I I6.

The shaft ||3 extends upwardly from the base plate and has an adjusting wheel I I1 at its upper end. Below the sleeve I I6, the shaft has a limiting pin ||9 that is engageable against the opposite sides of a depending stop |26 which is an integral part of the bracket 15. This pin is given freedom to move, by the notch 69 in the wall 35.

The wheel ||1 is formed in conical shape, with a series of radial fins extending over the upper surface, as shown. The ns are good heat dissipators, and, as a result, the adjustment of the wheel by contact of an operators thumb is not endangered by excess heat at the point of contact. Also, the area between the ns is not normally touched by the hand, and alfords a place for imprinted legends that are not rubbed off in use.

It will be seen that the rotation of the handle ||1 turns the cam I I6, and thereby presets the positions of the two switch blades and 9| relative to the end of the bimetal 10.

The terminal |02 of the switch blade 90 is connected to a wire |25 suitably insulated, preferably by insulating beads, as shown, for example, in Fig. 7, and extending in the cut-away portion 50 back to the rear part thereof where it is electrically joined (Fig. l2) to a jumper |26 that is connected to the terminal 29 of the heating element. The terminal |0| on the blade 9| is likewise connected with a wire |21 that is similarly insulated and that similarly extends backwardly in the depression 50 to be connected with the terminal 60. The other end of the heating element is connected by a wire |28 with the terminal 6 I.

When the foregoing parts are duly positioned, but without the adjusting wheel II1, the cover vplate or shroud 22 of the iron may be disposed over the sole plate. This cover has its edges engaging over the horizontal shelf 3| at the lower part of the sole plate. Preferably it overhangs the rear of the sole plate. It has an opening |30 in its top surfacey through which the shaft |I3 of the thermostatic adjustment means may pro-l ject. It also has a keyhole slot |3I at its forward end. As Shown in Fig. 2, the material below the opening |3| projects down to form locking cams |32.

At its middle part, the cover has two depressions |33 in its upper surface to receive screws |34, by means of which the cover may be unitedl to the sole plate.. 'he walls 34 and 35 are duly drilled to receive these screws. At its rear end, the cover has openings to receive handle fixing screws, as will appear. The bottom opening of theloverhang is enclosed by a plate |36, held in place by a screw |31 that extends into a post |38 that is secured to a depressed tongue on the top of the cover 22. The cover is also provided with an opening through its top for the passage of the connecting leads.

An insulating spacer, in `the form of a skeletonized plate 23, is located over the top of the cover 22. This insulating plate has downturned edges, as shown at |40, for example, in Fig. 8, that rest upon the top of the cover 22. It may have a plurality of openings |4I, |42, |43, and the like, in its top surface. Some of these openings may be used to give passage to upwardly projecting parts, or to give access to parts below them. This insulating spacer 23 extendsout almost to the back of the projecting part of the cover 22. The side edges are preferably cut away in wide notches |45 at intervals therealong, to provide free passage of air from one side to the other of the iron beneath the plate 23. The forward notches |45 also afford access to the hexagon head on the sleeve ||ll of the thermostat which stands above the top of the casing. A narrow wrench may be inserted through the slot for calibration of the thermostat when the iron is assembled.

This plate 23 may be laid over the top of the cover 22. Above it is disposed the plate 24, which is preferably of some heat insulating material, such as a thermosetting plastic.

The plate 24 extends upwardly at its forward end in substantially a continuation of the prow line of the iron. It has a front horizontal surface |48 that is cut away at |49 to receive the thermostat adjusting wheel ||1. An opening |50 through this forward portion of the plate 24 provides passage for the upwardly projecting shaft 3 of the thermostat. It is desirable to have the adjusting wheel ||1 located a little to one side of the center of these parts, as shown more particularly in Fig. 1.

The plate 24 extends backwardly to the rear of the plate 23 and laterally to the sides thereof, so as to provide insulation over the entire upper surface of the iron. The plate has a hole |52 down through its forward end, for a purpose that will appear. It also has a hole |53 at the rear for a purpose to appear. About a third of the way back of the toe end of the iron, the insulating plate 24 has a projection |55 extending from its bottom surface and shaped to the same shape as the opening |42 in the lower plate 23. Thus, when the upper plate 24 is in place, this projection will hold these two parts fixed against twisting relative to each other.v Also the projection |55 has four recesses |51 engageable over four upturned prongs |58 on the cover 22, so that the plates 23 and 24 are held properly against twisting on the cover. Y

Preferably, too, the plate 24 is cut away on its lower edge, so that it bears directly on the plate 23 only at its toe end and beneath the rear of the handle. This gives an air slot |56 extending across a large part of the extent of the insulating plate 24 from side to side of the iron.

The handle itself may be made of molded material. It has a forward post |60, preferably with a forward edge that aligns with the prow of the iron to give a smooth appearance. lt has a rear post |6| that rests upon the top of the rar part of the plate 24.

The toe of the handle receives a locking rod |62 that is most desirably molded into the handle itself. The shape shown in Fig. 6 provides great security, both against being pulled out and against its being twisted within the handle. The lower end of this rod carries a cross pin |63. When the handle is twisted about from the position shown, the rod |62 will pass through the openings in the several parts, and finally through the keyhole slot |3| in the top of the casing 22. It then is located below the lower edge of the cams |32, and, when the handle is twisted back to the position shown, the cross pin |63 locks tightly beneath the cam member,

tholding the` handle, casing, and intermediate parts securely together.

The rear end of the handle is hollowed out at |68 (Figs. 16 and 17). This provides a receptacle for the electric wires to the iron, and an air space for reduced heat conductivity. An outlet opening |69 through the ywall of the handle provides an outlet for the wires, which at this point may' be surrounded by the usual protecting spring |10 attached within the outlet opening |69 and securable outside the handle by a nut.

Two metal inserts |1| and |12 are molded into the bottom of the rear post |6| of the handle. Each of these is tapped so as to form a screwreceiving bushing. When the handle is engaged with the casing at its front, and aligned as shown, a pair of screws |13 may be passed in from the bottom of the casing through the two plates 23 and 24 and into the inserts |1| and |12 in the bottom of the handle post. This will provide for final securing together of the casing, plates and handle. The opening |68 in the handle is of sufficient size to permit use of a cable clamp on the wires, or any other means to resist their being pulled out against their securernent to the terminals.

The bottom of the post 16| is preferably cut away at |15 and |16 to provide air space beneath the handle post, and thereby reduce the transmission of heat therethrough. j

It will be seen that the disassembly of the iron may be made by removal of the plate |36 beneath the overhang of the cover.

The overall assembly of the iron is as follows:

The sole plate parts, shown in Figs. l2 to 15, are

assembled in the manner shown therein. As stated, the heating element is cast as a part of the sole plate itself. The terminal parts may be added in the obvious manner, and the bimetal strip 10 applied in place. Thereafter, the thermostatic cut-off switch may be applied by the attachment of its bracket 15 to the two buttons 39 and 46 on the top of the sole plate member. The connections |25 and |21 to this switch may readily be made in the foregoing operation. The thermostat may be calibrated by adjustment of the sleeve ||0 in the extension of the bracket 15. ci

Thereafter, the cover 22 is laid over the top of the sole plate, and secured thereto by the screws |34. Then the insulating plate 23 and the plate 24 are, in the order named, disposed on top of the sole plate, following which the thermostat knob ||1 is located in place. Thereafter, the connections through the handle may be brought down into the cover plate and screwed onto the terminal connections 60 and 6 l. It will be seen that the screws for these terminals are j assibe, thrughh? POW??? 2f IWWFFFl-tg;

of thecover 22' when its plate |36 is not in place. Then the handle rod |62 is fitted` through the plates and the keyhole slot lili inthe casing, and the Ahandle is turned about 130 from the position shown. The two screws |13 may be inserted from the bottom of the iron through the presentlyopen overhanging part of the cover 22. It will be seeny that these two screws |13 are located laterally of the terminals S and 0|, Vso that they are accessible. This secures the parts together. Then the plate |35 may be located in position and held there by the screw ISI.

When the iron is plugged in, current will be applied through the thermostatic switch to the heating element.- When the iron attains a, degree of temperature sufficient to raise the bimetal 70 and lift the shoe 98 a predetermined distance, it will break the contacts 99 and |00 and cut oi power from the heating element. v

The position of the bimetal required to open the two contacts is determined by the adjustment of the wheel ||1 and the cam HS, which act through the extension |05 on the lever 84. The lever 84, as already mentioned, is urged to bring its extension |05 against the cam I|0 by the spring 85. The lever in Figs. 2 and 9 is shown in its maximum downward position. In Fig. 9, the switch is removed from the iron, but Fig. 2 shows that this cam position opens the contacts and provides an off position of the switch. As the cam is rotated from the position shown, the lever 84 will be lifted by the spring 35, the shoe 08 may be lifted from the bimetal 10, and the contacts 99 and |00 will close. The point of closure of the contacts is the lowest heat setting for the iron, as any slight heating and warping of the bimetal l0 will lift the contact 99 away from the contact |00. Further twisting of the cam and lifting of the lever 84 'will increase the amount of warping required to break the contacts, and hence increase the iron temperature.

This iron is designed to be cool adjacent the handle. The plate 23 forms a large air space beneath the handle which is open to the free air at the sides of the iron. The plate, being skeletonized, is a poor heat conductor. The plate 24 likewise is open to atmosphere in its space |56. Additionally, the handle itself is provided `with the spaces and |16, all of which open to the sides of the iron and permit 'the circulation of air.

Also, the plate '24 extends from side to side of the iron below the handle, so that a low handle may be used on this iron without the danger of burning the knuckles of the user. The handle construction provides a means for the rapid assembly of these parts.

The operating knob is conveniently accessible to the thumb of the operator. It may be turned readily at any time to change the degree of heat that will be maintained by the iron.

It will also be seen that the elevated parts on the sole plate are all spaced from'the shroud 22, so as to provide air spaces between them and the shroud at all points except the bottom edge of the shroud. At the same time, the thermostatic mechanism is substantially enclosed, so as to be influenced by the actual heat of the sole plate. The bimetallic element 10 is almost surrounded by the parts of the sole plate itself, except at its top, and even there is disposed between the wall surrounding it. Also, the switch mechanism is compactly disposed by being located between the walls. Itmay also be observed that the switch pressure between the contacts 99 and A|0|i when the cam ||6 is turned. This comes about Vbecause both switch arms are displaced togetherA by adjustment of the cam. The leads to the switch are completely protected by being located in the space between the two side walls 34 an 35 of the sole plate. y

The handle is designed with a convenient thumb rest |80 above the thermostat wheel If the iron should be dropped, and some part broken, it is not a diiiicult task to replace such part. For example, if the handle itself is broken, it can be replaced as a single part without involving any of the other parts, such as the plate.24. It may also be remarked that the separation. of the handle 25 from the plate 24 provides .added coolness of the handle itself because of the relatively poor conductivity between the two parts.

What is claimed is:

l. In an electric iron, a sole plate, a coverthereover, a rst plate over the cover providing an air space above the cover, and a hand guard having a second plate above the rst plate, said second plate being of heat-insulating material and extending substantially across the top of the iron, a handle member separate from the second plate, the handle member including a hand grip portion and post means for supporting the grip portion above the second plate, and means.

said iirst plate having downturned edges engageable with the cover, and having a body portion supported above the cover by said edges, said body portion being skeletonized to reduce conduction of heat.

3. In an electric iron, a sole plate, a cover thereover, a rst plate disposed above the top of the cover and shaped to provide an air space over the cover, a second plate of insulating material disposed above the first plate, handle means including a front post and a rear post, an attaching member in one post engageable through the plates and cover and securable to the iron by -displacement from its position of insertion to a terial disposed above the first plate, handle means including a front post and a rear post, an attaching member in one post engageable through the plates and cover and securable to the iron by displacement from its position of insertion to a second position, and releasable attachment means engageable through the cover and plates into the other post to hold the parts together with the attaching member in second position, said cover overhanging the sole plate, and being open at the bottom of the overhang, said attachment means mechanism adjustment does not vary the contact being accessible through said opening.

5. In a sadiron, a sole plate, a rst plate, means supporting the first plate over the sole plate, an insulating plate over the top of the rst plate, the insulating plate and first plate having intertting, separable, projection and receptacle elements whereby they may be aligned together, the projection being integrally formed on one of said plates and the receptacle formed on the other, and means for securing the interfitted first and insulating plates and the sole plate together.

6. In a sadiron, a sole plate having a cover thereover, an insulating plate extending over the top of the cover, and a skeletonized spacing plate between the, insulating plate and the cover, the skeletonized plate having depending edge portions -and a top portion, the top portion being skeletonized to reduce heat conductivity, and means to secure the plates and cover and sole plate together, the skeletonized plate having one cut-away opening in its top portion of predetermined shape, and the insulating plate having an integral projection on its lower surface of complementary shape, to it down into the said opening and insure alignment of the two plates.

7. In a sadiron, a sole plate having a cover thereover, an insulating plate extending over the top of the cover, and a skeletonized spacing plate between the insulating plate and the cover, the skeletonized plate having depending edge portions and a top portion, the top portion being skeletonized to reduce heat conductivity, and means to secure the plates and cover and sole plate together, the skeletonized plate having one cutaway opening in its top portion of predetermined shape, and the insulating plate having an integral projection on its lower surface of complementary shape, to lit down into the said opening and insure alignment of the two plates, and interfitting projection and receptacle means between the cover and the projection on the insulating plate that passes into said opening of the skeletonized plate, to align the two plates and the cover.

8. In a sadiron, a sole plate, a cover thereover, a first plate substantially coextensive with the top of thecover, having downturned edge portions in contact with the cover, said portions providing limited contact with the cover, the top part of the iirst plate being skeletonized, an insulating plate substantially coextensive with the rst plate, positioned thereabove, and having bottom parts providing limited contact support on the first plate and air space between the two plates, a handle of insulating material having a grip portion and two posts, means connecting one handle post with the cover, through the two plates and attaching the handle, plates, and cover together, means connecting the other handle post, cover and two plates together, one connecting means being removable from the exterior of the said parts, and the other connecting means comprising interlocking parts between the handle post and cover, unlockable by displacement of the other handle post from its connected position relatively t the cover.

9. In a sadiron, a sole plate, a cover thereover, a first plate substantially coextensive with the top of the cover, having downturned edge portions in contact with the cover, said portions providing limited contact with the cover, the top part of the rst plate being skeletonized, an insulating plate substantially coextensive with the rst plate, positioned thereabove, and having bottom parts providing limited contact sup'- port on the first plate and air space between the two plates, a handle of insulating material having a grip portion and two posts, means connecting one handle post with the cover, through the twoplates and attaching the handle, plates, and cover together, means connecting the other handle post, cover and two plates together, one connecting means being removable from the exterior of the said parts, and the other connecting means comprising pin and slot elements between the cover and the handle post that are releasable when the one connecting means is released and the handle thereat is twisted away from connected position, and which interlock when the handle is twisted into connected position.

10. In a sadiron, a sole plate, a cover thereover, a rst plate substantially coextensive with the top of the cover, having downturned edge portions in contact with the cover, said portions providing limited contact with the cover, the top part of the rst plate being skeletonized, an insulating plate substantially coextensive with the first plate, positioned thereabove, and having bottom parts providing limited contact support on the rst plate and air space between the two plates, a handle of insulating material having a grip portion and two posts, means connecting one handle post with the cover, through the two plates and attaching the handle, plates, and cover together, means connecting the other handle post, cover and two plates together, one connecting means being removable from the eX- terior of the said parts, the cover overhanging the rear of the sole plate and open at the bottom of the overhang, electrical terminals at the rear of the sole plate, releasable at said open overhang, a wire receiving passage into the handle post at said overhang, and the other handle connecting means being accessible through the open overhang.

11. In a sadiron, a sole plate; a cover for said pole plate having a substantially flat upper surface a first plate substantially coextensive with said upper surface of the cover and having depending edge portions in contact therewith, the edge portions containing notches at the lower edges thereof to provide limited contact between the cover and the Iirst plate; and a second plate of insulating material disposed above the first plate and having bottom parts providing limited contact support on the first plate and an air space between them, the second plate being substantially coextensive with the first plate.

ERNEST BRAUNER. MAURICE J. DENNING.

REFERENCES CITED The following references are of record in the lile of this patent:

UNITED STATES PATENTS 

